A vapor response mechanism study of surface-modified single-walled carbon nanotubes coated chemiresistors and quartz crystal microbalance sensor arrays

Lu, Hung Ling; Lu, Chia Jung; Tian, Wei; Sheen, Horn‐Jiunn

doi:10.1016/j.talanta.2014.08.027

Cited by 36 publications

(15 citation statements)

References 45 publications

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“…Hence, fabrication of thin and uniform lms with sufficient mechanical adhesion to the surface is necessary. 17 For different target analytes, various sensing materials such as polymers, 18 metal oxides, 19 zeolites, 20 C 60 , 21 some functional materials, 22 nanostructured hybrid materials, 23 metal-organic frameworks (MOFs), 2,24,25 and carbon nanotubes (CNTs) 26 have been introduced to modify QCM sensors. QCMs have been used for biosensing 27 and humidity and oxygen sensing 28,29 as well.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)

Haghighi

Zeinali

2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)

Haghighi

Zeinali

2019

RSC Adv.

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“…It provides a highly sensitive, real-time, and low-cost method for vapor detection and is often used for gas/vapor [5][6][7] and humidity [8,9] detection. The sensitivity and selectivity of the QCM system can be improved by coating the electrode with specific materials, including polymers [9,10], metal oxides [11], and other functional materials [12]. Chitosan is one of the natural polysaccharide polymers containing the hydroxyl (-OH) and amino (-NH 2 ) groups.…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Based Quartz Crystal Microbalance for Alcohol Sensing

et al. 2018

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Short-chain alcohols are a group of volatile organic compounds (VOCs) that are often found in workplaces and laboratories, as well as medical, pharmaceutical, and food industries. Real-time monitoring of alcohol vapors is essential because exposure to alcohol vapors with concentrations of 0.15–0.30 mg·L−1 may be harmful to human health. This study aims to improve the detection capabilities of quartz crystal microbalance (QCM)-based sensors for the analysis of alcohol vapors. The active layer of chitosan was immobilized onto the QCM substrate through a self-assembled monolayer of L-cysteine using glutaraldehyde as a cross-linking agent. Before alcohol analysis, the QCM sensing chip was exposed to humidity because water vapor significantly interferes with QCM gas sensing. The prepared QCM sensor chip was tested for the detection of four different alcohols: n-propanol, ethanol, isoamyl alcohol, and n-amyl alcohol. For comparison, a non-alcohol of acetone was also tested. The prepared QCM sensing chip is selective to alcohols because of hydrogen bond formation between the hydroxyl groups of chitosan and the analyte. The highest response was achieved when the QCM sensing chip was exposed to n-amyl alcohol vapor, with a sensitivity of about 4.4 Hz·mg−1·L. Generally, the sensitivity of the QCM sensing chip is dependent on the molecular weight of alcohol. Moreover, the developed QCM sensing chips are stable after 10 days of repeated measurements, with a rapid response time of only 26 s. The QCM sensing chip provides an alternative method to established analytical methods such as gas chromatography for the detection of short-chain alcohol vapors.

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“…By deposition on an appropriate sensing chip, the microbalance responds to specific analytes via a frequency shift, which results from the mass increase caused by sorption of analytes onto the sensing material, according to the Sauerbrey equations (Sauerbrey 1959). Various sensing materials such as polymers Rianjanu et al 2019b), metal oxides (Zhang et al 2018, and some functional materials (Lu et al 2015) have been introduced to modify QCM sensors.…”

Section: Introductionmentioning

confidence: 99%

An Enhanced Safrole Sensing Performance of a Polyacrylonitrile Nanofiber- Based-QCM Sensor by Overlaying with Chitosan

Rianjanu¹,

Triyana²,

Nurbaiti³

et al. 2019

JSM

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We report on a method to enhance the sensing performance of polyacrylonitrile (PAN) nanofiber-based QCM sensor overlaid with chitosan. The PAN nanofibers were deposited on the QCM sensing surface by electrospinning technique followed by overlay with chitosan by a drop-casting method. The Fourier transform infrared (FTIR) spectra confirm that chitosan covers the PAN nanofibers. The SEM images show the average diameter of the produced PAN nanofibers was 236 nm, and it increased to 283 nm after overlay with chitosan. The modified QCM sensor has the sensitivity of 18.7 Hz mg -1 L, which is better than that of PAN nanofiber alone of 4.5 Hz mg -1 L. It is an increase nearly 5 times. The analytical parameters of the limit of detection (LOD), sensitivity, a time constant, and stability improved after the PAN nanofiber sensor was overlaid with chitosan. The amine groups present in chitosan interact effectively with safrole, thus increase the sensing response. The proposed device is robust, inexpensive, and convenient for detecting safrole, and can be used as an alternative to those of classical instrumental methods for the analysis of safrole as a drug precursor. ABSTRAK Kajian ini melaporkan tentang kaedah untuk meningkatkan prestasi pengesanan poliakrilonitril (PAN) berasaskan sensor gentian nano QCM yang disaluti dengan kitosan. PAN nanofiber diendap pada permukaan pengesan QCM oleh teknik putaran elektro diikuti dengan salutan kitosan melalui kaedah drop-pemutus. Spektrum transformasi Fourier inframerah (FTIR) mengesahkan kitosan menutup gentian nano PAN. Imej SEM menunjukkan diameter purata gentian nano PAN yang dihasilkan adalah 236 nm dan ia meningkat kepada 283 nm selepas bertindih dengan kitosan. Sensor QCM terubah suai mempunyai kesensitifan 18.7 L mg -1 Hz, lebih baik daripada gentian nano PAN sahaja iaitu 4.5 Hz mg -1 L. Ini merupakan peningkatan hampir 5 kali ganda. Analisis parameter had pengesanan (LOD), kesensitifan, pemalar masa dan kestabilan bertambah baik selepas sensor gentian nano PAN disaluti dengan kitosan. Golongan amina yang hadir dalam kitosan berinteraksi secara berkesan dengan safrola, sekaligus meningkatkan respons pengesanan. Peranti cadangan ini teguh, murah dan mudah untuk mengesan safrola dan boleh digunakan sebagai alternatif kepada metod instrumen klasik untuk menganalisis safrola sebagai pelopor dadah.

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A vapor response mechanism study of surface-modified single-walled carbon nanotubes coated chemiresistors and quartz crystal microbalance sensor arrays

Cited by 36 publications

References 45 publications

Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)

Nanoporous MIL-101(Cr) as a sensing layer coated on a quartz crystal microbalance (QCM) nanosensor to detect volatile organic compounds (VOCs)

Chitosan-Based Quartz Crystal Microbalance for Alcohol Sensing

An Enhanced Safrole Sensing Performance of a Polyacrylonitrile Nanofiber- Based-QCM Sensor by Overlaying with Chitosan

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